WO2017014687A1 - Method and apparatus for water treatment - Google Patents

Method and apparatus for water treatment Download PDF

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Publication number
WO2017014687A1
WO2017014687A1 PCT/SE2016/050630 SE2016050630W WO2017014687A1 WO 2017014687 A1 WO2017014687 A1 WO 2017014687A1 SE 2016050630 W SE2016050630 W SE 2016050630W WO 2017014687 A1 WO2017014687 A1 WO 2017014687A1
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WO
WIPO (PCT)
Prior art keywords
compartment
container
layer
water
small particles
Prior art date
Application number
PCT/SE2016/050630
Other languages
French (fr)
Inventor
Daniel Andersson
Original Assignee
Da Innovation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Da Innovation filed Critical Da Innovation
Priority to EP16828143.4A priority Critical patent/EP3325125A1/en
Publication of WO2017014687A1 publication Critical patent/WO2017014687A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/36—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed fluidised during the filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0012—Settling tanks making use of filters, e.g. by floating layers of particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/003—Coaxial constructions, e.g. a cartridge located coaxially within another
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1205—Particular type of activated sludge processes
    • C02F3/1215—Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of phosphates
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1242—Small compact installations for use in homes, apartment blocks, hotels or the like

Definitions

  • the present disclosure relates to a method and an apparatus for water treatment.
  • a treatment plant of some kind When treating water to be returned to nature a treatment plant of some kind is typically employed.
  • the treatment in a treatment plant can undergo multiple processes.
  • water to be treated can undergo a chemical treatment.
  • a chemical substance is added to extract different substances, such as phosphates, from the water using a precipitation process.
  • precipitation of phosphorus In precipitation of phosphorus a sludge is formed. The precipitated phosphorus sludge is then removed and is taken care of together with other sludge from the treatment plant.
  • an apparatus for treatment of water comprises a container. Untreated water can be fed to the container.
  • the apparatus comprises - an inlet to a first compartment of said container, wherein said first compartment is adapted to receive a solid substance having small particles,
  • FIG. 1 is a view of an apparatus for treatment of water according to a first embodiment
  • - Fig. 2 is a view of an apparatus for treatment of water according to a second embodiment
  • - Fig. 3 is a view of an apparatus for treatment of water according to a third embodiment
  • Fig. 4 is a flow chart illustrating some steps performed when treating water
  • FIG. 1 a side view and a sectional view along the section A- A of an apparatus 1 for treatment of water is shown.
  • the apparatus 1 comprises a container 2 to which untreated water 3 can be fed via an inlet 10.
  • the flow of water through the apparatus 1 is generally shown by arrows in the figure.
  • the container 2 can generally be divided into two compartments, a first compartment 12 for receiving untreated water and to treat water and a second compartment 13 provided down streams the first compartment 12.
  • An outlet 11 for treated water is in fluid connection with the second compartment via which outlet treated water exits the apparatus 1.
  • a connecting part 14 can be provided that allows water to flow from the first
  • the first compartment 12 and the second compartment 13 are communicating vessels.
  • an air permeable layer 4 is provided in the container 2 in the container 2 in the container 2 in the container 2 in the container 2 in the container 2 in the container 2 in the container 2
  • the container 2 is designed with an outer wall forming an outer wall and also inner separation wall separating the first compartment 12 from the second compartment 13. Both the inner separation wall and the outer wall can have a generally circular cross section.
  • untreated water 3 will first flow into an outer first compartment 12 of the container 2 having a generally annular cross section in which treatment is performed and then be fed to the inner second compartment 13 of the container 2 with a generally circular cross section from which treated water can leave the container.
  • the connection 14 is formed by a lower section of the container 2.
  • Other types of connections are possible such as a pipe connection. Water can also be pumped between different compartments of the apparatus 1.
  • the air permeable layer 4 can wholly or partly be made of a polymer material or a fine meshed metal net having a suitable hole dimension.
  • the holes in the layer 4 can have a size in the range 50 -1000 micro meters, in particular 200 - 700 micro meters. In some applications the size of the holes can be bigger for example in the range 0.5 - 2 mm.
  • the container 2 there can also be a space to place a bed of a solid substance 6 having suitable dimensions or a mix of different dimensions.
  • the solid substance 6 can for example be a sand material or a clay material. For example rock flour, a slag material or a Leca material can be used.
  • the solid substance can advantageously have dimension in the range 50 - 1000 micro meters.
  • the solid substance 6 can also comprise particles with bigger dimensions that in use will split into particles with smaller particle sizes.
  • the solid substance 6 can when aerated have properties such that the particles of the solid substance will split into particles of smaller sizes at a suitable rate such that smaller particles of the solid substance 6 is continuously formed or is formed when the solid substance is aerated.
  • the solid substance 6 can be supplied during the treatment process performed in the apparatus 1 such that there is always a suitable amount of particles of the solid substance in the first compartment 12 that phosphorous compounds can bond to.
  • the supply of the solid substance 6 can for example take place continuously or when untreated water is fed to the first compartment 12.
  • the air permeable layer 4 is further designed so that the solid substance 6 can rest on top of the air permeable layer and such that small particles of the solid substance can pass through the layer 4 when air passes up through the layer as is described below. This can be said to be analogous to an aerated sand filter or a fluidized bed.
  • a bed is provided in the first compartment 12 of the container 2.
  • the bed comprises a solid substance of small particles and the untreated water is located on top of the bed.
  • an aerating device 7 is located under the air permeable layer 4 .
  • the aerating device is provided to generate air under the air permeable layer 4 so that air will rise through the layer 4 and aerate the bed of solid substance particles 6 on top of the layer 4 and the water 3 inside the first compartment 12 of the container 2.
  • the layer 4 can in accordance with one embodiment be aerated under only a part, such as a central part, of the layer 4.
  • a collection container 8 is also located under the layer 4 a collection container 8 is also located. In the example of Fig. 1, the collection container 8 is formed by the bottom of the connection 14. In other embodiments a separate collection container 8 can be provided. The collection container 8 can then be removable for emptying or exchange of the collection container 8.
  • the shape of the collection container 8 can in accordance with some embodiments be tapered for example conically tapered.
  • the apparatus 1 can typically also be provided with a feed device for feeding a precipitation agent or flocking agent.
  • a flocking agent is added when treatment of water is performed.
  • suitable flocking agents when water is to be purified from phosphorus are solutions comprising Aluminum, Iron or Calcium.
  • Aluminium sulfate or Aluminium chloride can be added in solid or liquid form.
  • suitable forms of Iron chloride or Calcium chloride is used.
  • an emptying device 9 for removal of precipitated materials collected in the container 8 can also be provided.
  • the emptying device 9 can for example be adapted to vacuum/suck solid materials from the container 8.
  • FIG. 2 another embodiment of the apparatus 1 is shown.
  • the inlet is provided in the center of the container 2 and the outlet is connected to an outer section of the container 2.
  • Other possible embodiments include a configuration where the outlet 11 unlike in Fig. 1 and Fig. 2 is located at a higher level than the inlet 10.
  • Such an embodiment s shown in Fig. 3. It is also possible to arrange the inlet 10 and the outlet 11 at essentially the same level.
  • the outlet 11 is located at a level above the layer 4 that is provided inside the apparatus 1.
  • the container 2 does not necessarily need to be made as one single container but can instead be divided into two or more serially connected containers in communication with each other.
  • one or more of the parts 12, 13, 14 can be formed as separate containers connected to each other so that untreated water can be fed to the part 12 to then pass the part 14 before the water reaches the part 13.
  • a collector container 8 still needs to be provided below the layer 4 for collection of particles passing down through the layer 4. Water can be transferred between the different part by pressure or in accordance with some embodiments by pumping.
  • Fig. 4 a flowchart describing different steps performed in the apparatus 1 when treating water therein.
  • untreated water for example comprising phosphates
  • a treatment process is started.
  • a chemical substance is added to the first compartment to extract a substances from the untreated water in a step 403 and the bed comprising a solid substance of small particles 6 is aerated through the layer 4.
  • the added chemical substance can typically be a precipitation or flocking agent.
  • the chemical substance will bond the phosphorus substance in the water and the chemical compounds then formed will bond onto the small particles of the solid substance in the bed 6 (or onto small particles added) that is aerated by the aerating device 7 in a step 405.
  • the small particles having a chemical compound comprising phosphorus will also be able to pass downwards through the layer under the force of gravity to the collection container 8 located thereunder.
  • the small particles will then be collected in the collection container in a step 407.
  • the collection container 8 collects very small particles (small enough to pass down through the layer when the layer is aerated) and these particles have chemical compounds comprising phosphorus bonded thereon (or whatever substance the apparatus is designed to purify the water from).
  • the collection container 8 can then be emptied in a suitable manner. As set out above the emptying can be performed by vacuuming using the emptying device 9 or by removal/ exchange of the collection container 8.
  • the material in the container 6 will, in case phosphorus is removed from the water, comprise a chemical compound comprising phosphorus that is easy to re-circulate. If for example aluminum is used in the flocking agent the solid material in the collection container 8 will comprise Aluminium phosphate bonded to the small particles in the solid substance.
  • aerating is only performed when untreated water is supplied to thereby reduce consumption of the solid substance in the bed 6. Further, dosing of the flocking agent can be made in response to the current supply of untreated water.
  • the solid substance can also be dosed and continuously be added in the corresponding manner as the chemical substance, e.g. a flocking agent. Adding of the solid substance can be performed using a feeding device.
  • the shape of the container can be any shape and does not need to be circular.
  • the container can be square or rectangular.
  • the apparatus is suitable to purify water from different chemical compounds and not only phosphorus sbstances.
  • different metals such as Cupper and also Cadmium can be removed from the water using the apparatus.
  • the flocking agent used is then adapted to the chemical compound to be removed from the water by the apparatus.
  • the water treatment apparatus and water treatment process described herein is easy to implement and provides a residue, for example phosphorus compounds, that are easy to reuse since the chemical compounds removed from the water are separated from sludge.

Abstract

An apparatus and a method for treatment of water is described. The method comprises the steps: - providing (401 ) untreated water 83) to a first compartment (12) of a container (2) - providing (403) a precipitation agent to the first compartment to precipitate a substance such as phosphate from the untreated water in the first compartment and providing a solid substance (6) having small particles to the first compartment, - aerating (405) the mixture in the first compartment (12) to let an precipitated substance bond to the small particles of the solid substance, - by aerating the layer allow small particles having the precipitated substance bonded thereto pass (407) under the force of gravity down through the layer to a collection container (8) located underneath the layer, - output (409) treated water (5) from a second compartment (13) of the container located 10 down streams the layer (4).

Description

Method and apparatus for water treatment
TECHNICAL FIELD
The present disclosure relates to a method and an apparatus for water treatment. BACKGROUND
When treating water to be returned to nature a treatment plant of some kind is typically employed. The treatment in a treatment plant can undergo multiple processes. In one step water to be treated can undergo a chemical treatment. In a step of chemical treatment a chemical substance is added to extract different substances, such as phosphates, from the water using a precipitation process. In precipitation of phosphorus a sludge is formed. The precipitated phosphorus sludge is then removed and is taken care of together with other sludge from the treatment plant.
There is a desire to improve existing treatment processes and reduce the environmental impact caused by existing treatment processes.
SUMMARY
It is an object of the present invention to solve the above problem or at least reduce the negative environmental impact caused by existing treatment processes.
This object is at least partly obtained by the invention as set out in the appended claims.
In accordance with one embodiment an apparatus for treatment of water is provided. The apparatus for treatment of water comprises a container. Untreated water can be fed to the container. The apparatus comprises - an inlet to a first compartment of said container, wherein said first compartment is adapted to receive a solid substance having small particles,
- an air permeable layer provided in the container down streams the first compartment,
- an aerating device located beneath the air permeable layer,
- a second compartment located down streams said air-permeable layer,
- a collection container located beneath said air permeable layer for collection of particles of the solid substance passing downwards through said layer during aerating, and
- an outlet for treated water from the second compartment. When untreated water is fed to the apparatus together with a chemical compound typically a precipitation or flocking agent, chemical compounds in the untreated water such a phosphorus will be precipitated using the precipitation agent. The precipitated chemical compounds will bond to the small particles of the solid substance and small particles having precipitated chemical compounds bonded thereto will during ongoing aerating and under the force of gravity pass downwards through the layer and can be collected in the collection container provided under the layer. The chemical compound in the collection container can then be taken care of and is easy to re-use.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described in more detail by way of non-limiting examples and with reference to the accompanying drawings, in which:
- Fig. 1 is a view of an apparatus for treatment of water according to a first embodiment,
- Fig. 2 is a view of an apparatus for treatment of water according to a second embodiment, - Fig. 3 is a view of an apparatus for treatment of water according to a third embodiment,
- Fig. 4 is a flow chart illustrating some steps performed when treating water
DETAILED DESCRIPTION In the following a water treatment apparatus will be described. In the figures, the same reference numerals designate identical or corresponding elements throughout the several figures. It will be appreciated that these figures are for illustration only and are not in any way restricting the scope of the invention. Also it is possible to combine features from different described embodiments to meet specific implementation needs.
In Fig. 1 a side view and a sectional view along the section A- A of an apparatus 1 for treatment of water is shown. The apparatus 1 comprises a container 2 to which untreated water 3 can be fed via an inlet 10. The flow of water through the apparatus 1 is generally shown by arrows in the figure. The container 2 can generally be divided into two compartments, a first compartment 12 for receiving untreated water and to treat water and a second compartment 13 provided down streams the first compartment 12. An outlet 11 for treated water is in fluid connection with the second compartment via which outlet treated water exits the apparatus 1. Between the first compartment 12 and the second compartment 13 a connecting part 14 can be provided that allows water to flow from the first
compartment 12 to the second compartment 13. Thus, in accordance with one embodiment the first compartment 12 and the second compartment 13 are communicating vessels. In the container 2 an air permeable layer 4 is provided. The air permeable layer 4 separates the first compartment 12 from the second compartment 13 in the container 2. In the
embodiment of Fig. 1, the container 2 is designed with an outer wall forming an outer wall and also inner separation wall separating the first compartment 12 from the second compartment 13. Both the inner separation wall and the outer wall can have a generally circular cross section. Thus, in accordance with the embodiment of Fig. 1 untreated water 3 will first flow into an outer first compartment 12 of the container 2 having a generally annular cross section in which treatment is performed and then be fed to the inner second compartment 13 of the container 2 with a generally circular cross section from which treated water can leave the container. In the embodiment shown in Fig. 1, the connection 14 is formed by a lower section of the container 2. Other types of connections are possible such as a pipe connection. Water can also be pumped between different compartments of the apparatus 1.
The air permeable layer 4 can wholly or partly be made of a polymer material or a fine meshed metal net having a suitable hole dimension. For example the holes in the layer 4 can have a size in the range 50 -1000 micro meters, in particular 200 - 700 micro meters. In some applications the size of the holes can be bigger for example in the range 0.5 - 2 mm. In the container 2 there can also be a space to place a bed of a solid substance 6 having suitable dimensions or a mix of different dimensions. The solid substance 6 can for example be a sand material or a clay material. For example rock flour, a slag material or a Leca material can be used. The solid substance can advantageously have dimension in the range 50 - 1000 micro meters. The solid substance 6 can also comprise particles with bigger dimensions that in use will split into particles with smaller particle sizes. For example, the solid substance 6 can when aerated have properties such that the particles of the solid substance will split into particles of smaller sizes at a suitable rate such that smaller particles of the solid substance 6 is continuously formed or is formed when the solid substance is aerated.
In accordance with one embodiment the solid substance 6 can be supplied during the treatment process performed in the apparatus 1 such that there is always a suitable amount of particles of the solid substance in the first compartment 12 that phosphorous compounds can bond to. The supply of the solid substance 6 can for example take place continuously or when untreated water is fed to the first compartment 12. The air permeable layer 4 is further designed so that the solid substance 6 can rest on top of the air permeable layer and such that small particles of the solid substance can pass through the layer 4 when air passes up through the layer as is described below. This can be said to be analogous to an aerated sand filter or a fluidized bed. In accordance with one embodiment a bed is provided in the first compartment 12 of the container 2. The bed comprises a solid substance of small particles and the untreated water is located on top of the bed.
Under the air permeable layer 4 an aerating device 7 is located. The aerating device is provided to generate air under the air permeable layer 4 so that air will rise through the layer 4 and aerate the bed of solid substance particles 6 on top of the layer 4 and the water 3 inside the first compartment 12 of the container 2. The layer 4can in accordance with one embodiment be aerated under only a part, such as a central part, of the layer 4. Under the layer 4 a collection container 8 is also located. In the example of Fig. 1, the collection container 8 is formed by the bottom of the connection 14. In other embodiments a separate collection container 8 can be provided. The collection container 8 can then be removable for emptying or exchange of the collection container 8. The shape of the collection container 8 can in accordance with some embodiments be tapered for example conically tapered.
The apparatus 1 can typically also be provided with a feed device for feeding a precipitation agent or flocking agent. In accordance with one embodiment a flocking agent is added when treatment of water is performed. Examples of suitable flocking agents when water is to be purified from phosphorus are solutions comprising Aluminum, Iron or Calcium. In accordance with some embodiments Aluminium sulfate or Aluminium chloride can be added in solid or liquid form. In accordance with some embodiments suitable forms of Iron chloride or Calcium chloride is used.
In the apparatus 1 an emptying device 9 for removal of precipitated materials collected in the container 8 can also be provided. The emptying device 9 can for example be adapted to vacuum/suck solid materials from the container 8.
In fig. 2 another embodiment of the apparatus 1 is shown. In Fig. 2 the inlet is provided in the center of the container 2 and the outlet is connected to an outer section of the container 2. Other possible embodiments include a configuration where the outlet 11 unlike in Fig. 1 and Fig. 2 is located at a higher level than the inlet 10. Such an embodiment s shown in Fig. 3. It is also possible to arrange the inlet 10 and the outlet 11 at essentially the same level. In accordance with some embodiments the outlet 11 is located at a level above the layer 4 that is provided inside the apparatus 1.
Further modifications of the apparatus are possible. For example the container 2 does not necessarily need to be made as one single container but can instead be divided into two or more serially connected containers in communication with each other. For example, one or more of the parts 12, 13, 14 can be formed as separate containers connected to each other so that untreated water can be fed to the part 12 to then pass the part 14 before the water reaches the part 13. In such a set-up a collector container 8 still needs to be provided below the layer 4 for collection of particles passing down through the layer 4. Water can be transferred between the different part by pressure or in accordance with some embodiments by pumping.
In Fig. 4 a flowchart describing different steps performed in the apparatus 1 when treating water therein. First, in a step 401, untreated water, for example comprising phosphates, is fed to the container 2 a treatment process is started. In the treatment process a chemical substance is added to the first compartment to extract a substances from the untreated water in a step 403 and the bed comprising a solid substance of small particles 6 is aerated through the layer 4. The added chemical substance can typically be a precipitation or flocking agent. The chemical substance will bond the phosphorus substance in the water and the chemical compounds then formed will bond onto the small particles of the solid substance in the bed 6 (or onto small particles added) that is aerated by the aerating device 7 in a step 405.
Through the aerating process the small particles having a chemical compound comprising phosphorus will also be able to pass downwards through the layer under the force of gravity to the collection container 8 located thereunder. The small particles will then be collected in the collection container in a step 407. As more untreated water is supplied water is pressed (or pumped) down streams through the apparatus to the second compartment 13 via the connection 14. Water reaching the second compartment 13 is purified from e.g. phosphorus substances and treated water can leave the container 2 in a step 409.
Thus, the collection container 8 collects very small particles (small enough to pass down through the layer when the layer is aerated) and these particles have chemical compounds comprising phosphorus bonded thereon (or whatever substance the apparatus is designed to purify the water from). The collection container 8 can then be emptied in a suitable manner. As set out above the emptying can be performed by vacuuming using the emptying device 9 or by removal/ exchange of the collection container 8. The material in the container 6 will, in case phosphorus is removed from the water, comprise a chemical compound comprising phosphorus that is easy to re-circulate. If for example aluminum is used in the flocking agent the solid material in the collection container 8 will comprise Aluminium phosphate bonded to the small particles in the solid substance. In accordance with one embodiment, aerating is only performed when untreated water is supplied to thereby reduce consumption of the solid substance in the bed 6. Further, dosing of the flocking agent can be made in response to the current supply of untreated water. As set out above, the solid substance can also be dosed and continuously be added in the corresponding manner as the chemical substance, e.g. a flocking agent. Adding of the solid substance can be performed using a feeding device.
It is to be noted that the shape of the container can be any shape and does not need to be circular. For example the container can be square or rectangular. Further the apparatus is suitable to purify water from different chemical compounds and not only phosphorus sbstances. For example different metals such as Cupper and also Cadmium can be removed from the water using the apparatus. The flocking agent used is then adapted to the chemical compound to be removed from the water by the apparatus. The water treatment apparatus and water treatment process described herein is easy to implement and provides a residue, for example phosphorus compounds, that are easy to reuse since the chemical compounds removed from the water are separated from sludge.

Claims

1. An apparatus (1) for treatment of water comprising a container (2), wherein untreated water (3) can be fed to the container, characterized by:
- an inlet (10) to a first compartment (12) of said container, wherein said first compartment is adapted to receive a solid substance having small particles,
- an air permeable layer (4) provided in the container down streams the first compartment,
- an aerating device (7) located beneath the air permeable layer,
- a second compartment (13) located down streams said air-permeable layer,
- a collection container (8) located beneath said air permeable layer for collection of particles of the solid substance passing downwards through said layer during aerating, and
- an outlet (11) for treated water (5) from the second compartment (13).
2. The apparatus according to claim 1, wherein the container (2) has a generally circular cross section in a horizontal direction and wherein the container comprises both the first compartment (12) and the second compartment (13).
3. The apparatus according to claim 1 or 2, wherein the outlet (11) is located at a level above the level of the layer (4).
4. The apparatus according to any of claims 1 - 3, further comprising an emptying device (9).
5. The apparatus according to claim 5, wherein the emptying device is adapted to suck solid substances from the collection container.
6. The apparatus according to any of claims 1 - 5, wherein a solid substance is provided in the first compartment, the solid substance comprising small particles.
7. The apparatus according to claim 6 wherein the small particles comprises one or more of a rock material, a clay material or a slag material.
8. The apparatus according to any of claims 6 - 7, wherein the small particles have a dimension in the range 50 - 1000 micro meters.
9. The apparatus according to any of claims 6 - 8, comprising a bed of small particles on top of the layer.
10. The apparatus according to any of claims 6 - 8, comprising a feeding device for feeding the small particles to the first compartment.
11. The apparatus according to any of claims 1 - 10, wherein the layer comprises at least one of a polymer material and a metal net.
12. The apparatus according to any of claims 1 - 11, wherein the aerating device is adapted to provide an air flow set in response to the amount of untreated water fed to the apparatus.
13. The apparatus according to any of claims 1 - 12, wherein the collection container is separately removable from the apparatus.
14. The apparatus according to any of claims 1 - 13, wherein the untreated water comprises a chemical compound comprising phosphorus and the solid substance in the collection container comprises chemical compound comprising phosphorus.
15. A method for treatment of water comprising
- providing (401) untreated water (3) to a first compartment (12) of a container (2), - providing (403) a chemical substance to the first compartment to extract a substances from the untreated water in the first compartment and providing a solid substance (6) having small particles to the first compartment,
- aerating (405) the mixture in the first compartment (12) to let an extracted substance bond to the small particles of the solid substance,
- by aerating the layer allow small particles having the extracted substance bonded thereto pass (407) under the force of gravity down through the layer to a collection container (8) located underneath the layer,
- output (409) treated water (5) from a second compartment (13) of the container located down streams the layer (4).
16. The method according to claim 12, wherein particles passing down through the layer comprises a chemical compound comprising phosphorus.
PCT/SE2016/050630 2015-07-17 2016-06-27 Method and apparatus for water treatment WO2017014687A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16828143.4A EP3325125A1 (en) 2015-07-17 2016-06-27 Method and apparatus for water treatment

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1500309-8 2015-07-17
SE1500309A SE538885C2 (en) 2015-07-17 2015-07-17 Apparatus and method of purifying water

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US4071452A (en) * 1975-05-28 1978-01-31 Swiss Aluminium Ltd. Device for discharging particulate materials
US4330401A (en) * 1980-09-17 1982-05-18 Process Development Company Dynamic clarifier system
JPH0872977A (en) * 1994-09-02 1996-03-19 Tsukishima Kikai Co Ltd Pulverulence discharge device of tank and equipment by use thereof
WO2010140968A1 (en) * 2009-06-05 2010-12-09 Kenrex Envirotech Use of a composition for conditioning wastewater, and system, material and method for recycling wastewater components
WO2014063232A1 (en) 2012-10-26 2014-05-01 Centre De Recherche Industrielle Du Quebec System and method for treating waste water by means of passive phosphorus capture

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See also references of EP3325125A4

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EP3325125A1 (en) 2018-05-30

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